If you are drilling a Speed body for eyes, line up the crease where the (horinzontal) curves come together with an imaginary vertical line that represents the middle of the feedneck. Use a center-punch to score the aluminum (or aluminium). Drill through w/ a 3/16" bit. You now have a hole through the bottom of the breech.
*disclaimer: If you mess this up, I was giving free advice. I assume no responsibilty. It worked twice for me, with very good results. Be careful, use eye protection, look both ways before crossing the street.